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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <span>
#include <wtf/EnumTraits.h>
#include <wtf/SHA1.h>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
#include <wtf/persistence/PersistentCoders.h>
namespace WTF::Persistence {
template<typename> struct Coder;
class Encoder {
WTF_MAKE_FAST_ALLOCATED;
public:
WTF_EXPORT_PRIVATE Encoder();
WTF_EXPORT_PRIVATE ~Encoder();
WTF_EXPORT_PRIVATE void encodeChecksum();
WTF_EXPORT_PRIVATE void encodeFixedLengthData(std::span<const uint8_t>);
template<typename T, std::enable_if_t<std::is_enum<T>::value>* = nullptr>
Encoder& operator<<(const T& t)
{
static_assert(sizeof(T) <= sizeof(uint64_t), "Enum type must not be larger than 64 bits.");
return *this << static_cast<uint64_t>(t);
}
template<typename T, std::enable_if_t<!std::is_enum<T>::value && !std::is_arithmetic<typename std::remove_const<T>>::value>* = nullptr>
Encoder& operator<<(const T& t)
{
Coder<T>::encodeForPersistence(*this, t);
return *this;
}
WTF_EXPORT_PRIVATE Encoder& operator<<(bool);
WTF_EXPORT_PRIVATE Encoder& operator<<(uint8_t);
WTF_EXPORT_PRIVATE Encoder& operator<<(uint16_t);
WTF_EXPORT_PRIVATE Encoder& operator<<(uint32_t);
WTF_EXPORT_PRIVATE Encoder& operator<<(uint64_t);
WTF_EXPORT_PRIVATE Encoder& operator<<(int16_t);
WTF_EXPORT_PRIVATE Encoder& operator<<(int32_t);
WTF_EXPORT_PRIVATE Encoder& operator<<(int64_t);
WTF_EXPORT_PRIVATE Encoder& operator<<(float);
WTF_EXPORT_PRIVATE Encoder& operator<<(double);
const uint8_t* buffer() const LIFETIME_BOUND { return m_buffer.data(); }
size_t bufferSize() const { return m_buffer.size(); }
std::span<const uint8_t> span() const LIFETIME_BOUND { return m_buffer.span(); }
WTF_EXPORT_PRIVATE static void updateChecksumForData(SHA1&, std::span<const uint8_t>);
template <typename Type> static void updateChecksumForNumber(SHA1&, Type);
static constexpr bool isIPCEncoder = false;
private:
template<typename Type> Encoder& encodeNumber(Type);
std::span<uint8_t> grow(size_t);
template <typename Type> struct Salt;
Vector<uint8_t, 4096> m_buffer;
SHA1 m_sha1;
};
template <> struct Encoder::Salt<bool> { static constexpr unsigned value = 3; };
template <> struct Encoder::Salt<uint8_t> { static constexpr unsigned value = 5; };
template <> struct Encoder::Salt<uint16_t> { static constexpr unsigned value = 7; };
template <> struct Encoder::Salt<uint32_t> { static constexpr unsigned value = 11; };
template <> struct Encoder::Salt<uint64_t> { static constexpr unsigned value = 13; };
template <> struct Encoder::Salt<int32_t> { static constexpr unsigned value = 17; };
template <> struct Encoder::Salt<int64_t> { static constexpr unsigned value = 19; };
template <> struct Encoder::Salt<float> { static constexpr unsigned value = 23; };
template <> struct Encoder::Salt<double> { static constexpr unsigned value = 29; };
template <> struct Encoder::Salt<uint8_t*> { static constexpr unsigned value = 101; };
template <> struct Encoder::Salt<int16_t> { static constexpr unsigned value = 103; };
template <typename Type>
void Encoder::updateChecksumForNumber(SHA1& sha1, Type value)
{
auto typeSalt = Salt<Type>::value;
sha1.addBytes(asByteSpan(typeSalt));
sha1.addBytes(asByteSpan(value));
}
}
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